зеркало из https://github.com/mozilla/gecko-dev.git
140 строки
4.2 KiB
C++
140 строки
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef ADTS_DEMUXER_H_
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#define ADTS_DEMUXER_H_
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#include "mozilla/Attributes.h"
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#include "mozilla/Maybe.h"
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#include "MediaDataDemuxer.h"
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#include "MediaResource.h"
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#include "mp4_demuxer/ByteReader.h"
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namespace mozilla {
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namespace adts {
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class Frame;
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class FrameParser;
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}
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class ADTSTrackDemuxer;
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class ADTSDemuxer : public MediaDataDemuxer {
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public:
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// MediaDataDemuxer interface.
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explicit ADTSDemuxer(MediaResource* aSource);
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RefPtr<InitPromise> Init() override;
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bool HasTrackType(TrackInfo::TrackType aType) const override;
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uint32_t GetNumberTracks(TrackInfo::TrackType aType) const override;
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already_AddRefed<MediaTrackDemuxer> GetTrackDemuxer(
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TrackInfo::TrackType aType, uint32_t aTrackNumber) override;
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bool IsSeekable() const override;
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private:
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bool InitInternal();
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RefPtr<MediaResource> mSource;
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RefPtr<ADTSTrackDemuxer> mTrackDemuxer;
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};
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class ADTSTrackDemuxer : public MediaTrackDemuxer {
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public:
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explicit ADTSTrackDemuxer(MediaResource* aSource);
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// Initializes the track demuxer by reading the first frame for meta data.
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// Returns initialization success state.
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bool Init();
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// Returns the total stream length if known, -1 otherwise.
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int64_t StreamLength() const;
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// Returns the estimated stream duration, or a 0-duration if unknown.
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media::TimeUnit Duration() const;
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// Returns the estimated duration up to the given frame number,
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// or a 0-duration if unknown.
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media::TimeUnit Duration(int64_t aNumFrames) const;
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// MediaTrackDemuxer interface.
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UniquePtr<TrackInfo> GetInfo() const override;
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RefPtr<SeekPromise> Seek(const media::TimeUnit& aTime) override;
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RefPtr<SamplesPromise> GetSamples(int32_t aNumSamples = 1) override;
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void Reset() override;
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RefPtr<SkipAccessPointPromise> SkipToNextRandomAccessPoint(
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const media::TimeUnit& aTimeThreshold) override;
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int64_t GetResourceOffset() const override;
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media::TimeIntervals GetBuffered() override;
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private:
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// Destructor.
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~ADTSTrackDemuxer();
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// Fast approximate seeking to given time.
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media::TimeUnit FastSeek(const media::TimeUnit& aTime);
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// Seeks by scanning the stream up to the given time for more accurate results.
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media::TimeUnit ScanUntil(const media::TimeUnit& aTime);
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// Finds the next valid frame and returns its byte range.
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const adts::Frame& FindNextFrame(bool findFirstFrame = false);
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// Skips the next frame given the provided byte range.
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bool SkipNextFrame(const adts::Frame& aFrame);
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// Returns the next ADTS frame, if available.
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already_AddRefed<MediaRawData> GetNextFrame(const adts::Frame& aFrame);
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// Updates post-read meta data.
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void UpdateState(const adts::Frame& aFrame);
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// Returns the frame index for the given offset.
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int64_t FrameIndexFromOffset(int64_t aOffset) const;
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// Returns the frame index for the given time.
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int64_t FrameIndexFromTime(const media::TimeUnit& aTime) const;
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// Reads aSize bytes into aBuffer from the source starting at aOffset.
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// Returns the actual size read.
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int32_t Read(uint8_t* aBuffer, int64_t aOffset, int32_t aSize);
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// Returns the average frame length derived from the previously parsed frames.
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double AverageFrameLength() const;
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// The (hopefully) ADTS resource.
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MediaResourceIndex mSource;
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// ADTS frame parser used to detect frames and extract side info.
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adts::FrameParser* mParser;
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// Current byte offset in the source stream.
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int64_t mOffset;
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// Total parsed frames.
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uint64_t mNumParsedFrames;
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// Current frame index.
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int64_t mFrameIndex;
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// Sum of parsed frames' lengths in bytes.
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uint64_t mTotalFrameLen;
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// Samples per frame metric derived from frame headers or 0 if none available.
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uint32_t mSamplesPerFrame;
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// Samples per second metric derived from frame headers or 0 if none available.
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uint32_t mSamplesPerSecond;
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// Channel count derived from frame headers or 0 if none available.
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uint32_t mChannels;
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// Audio track config info.
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UniquePtr<AudioInfo> mInfo;
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};
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} // mozilla
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#endif // !ADTS_DEMUXER_H_
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